SKF 71818 ACD/P4 Angular contact ball bearings, super-precision
Angular contact ball bearings, super-precision
- P4: Dimensional and geometrical tolerances to ISO class 4
Description
SKF 71818 ACD/P4 specification parameter：
| d |
90 mm
|
Bore diameter |
|---|---|---|
| D |
115 mm
|
Outside diameter |
| B |
13 mm
|
Width |
| d1 |
98.2 mm
|
Shoulder diameter of inner ring (large side face) |
| d2 |
98.2 mm
|
Shoulder diameter of inner ring (small side face) |
| D1 |
107.1 mm
|
Shoulder diameter of outer ring (large side face) |
| r1,2 |
min.1 mm
|
Chamfer dimension (large side face) |
| r3,4 |
min.0.3 mm
|
Chamfer dimension (small side face) |
| a |
30.5 mm
|
Distance from side face to pressure point |
ABUTMENT DIMENSIONS
| da |
min.94.6 mm
|
Diameter of shaft abutment |
|---|---|---|
| db |
min.94.6 mm
|
Diameter of shaft abutment |
| Da |
max.110.4 mm
|
Diameter of housing abutment |
| Db |
max.113 mm
|
Diameter of housing abutment |
| ra |
max.1 mm
|
Radius of fillet |
| rb |
max.0.3 mm
|
Radius of fillet |
| dn |
99.1 mm
|
Psition of oil nozzle |
CALCULATION DATA
| Basic dynamic load rating | C |
20.3 kN
|
|---|---|---|
| Basic static load rating | C0 |
25 kN
|
| Fatigue load limit | Pu |
1.04 kN
|
| Attainable speed for grease lubrication |
10 000 r/min
|
|
| Attainable speed for oil-air lubrication |
15 000 r/min
|
|
| Contact angle | α |
25 °
|
| Ball diameter | Dw |
7.144 mm
|
| Number of balls | z |
31
|
| Reference grease quantity | Gref |
2.9 cm³
|
| Preload class A | GA |
184 N
|
|---|---|---|
| Static axial stiffness, preload class A |
194 N/µm
|
|
| Preload class B | GB |
555 N
|
| Static axial stiffness, preload class B |
307 N/µm
|
|
| Preload class C | GC |
1 110 N
|
| Static axial stiffness, preload class C |
420 N/µm
|
| Correction factor dependent on bearing series and size | f |
1.33
|
|---|---|---|
| Correction factor dependent on contact angle | f1 |
0.97
|
| Correction factor, preload class A | f2A |
1
|
| Correction factor, preload class B | f2B |
1.08
|
| Correction factor, preload class C | f2C |
1.15
|
| Correction factor for hybrid bearings | fHC |
1
|
| Limiting value | e |
0.68
|
| Axial load factor (single, tandem) | Y2 |
0.87
|
| Axial load factor (single, tandem) | Y0 |
0.38
|
| Radial load factor (single, tandem) | X2 |
0.41
|
| Axial load factor (back-to-back, face-to-face) | Y1 |
0.92
|
| Axial load factor (back-to-back, face-to-face) | Y2 |
1.41
|
| Axial load factor (back-to-back, face-to-face) | Y0 |
0.76
|
| Radial load factor (back-to-back, face-to-face) | X2 |
0.67
|
MASS
| Mass |
0.28 kg
|
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